Zeng Yixin, the vice minister of the National Health Commission, said he was “rather taken aback” that the plan includes further investigation of the theory that the virus might have leaked from a Chinese lab.

He dismissed the lab leak idea as a rumor that runs counter to common sense and science.

“It is impossible for us to accept such an origin-tracing plan,” he said at a news conference called to address the COVID-19 origins issue…

Zeng said the Wuhan lab has no virus that can directly infect humans and noted that the WHO team concluded that a lab leak was highly unlikely. He added that speculation that staff and graduate students at the lab had been infected and might have started the spread of the virus in the city was untrue.